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At 28 millimeters from a sound source, the intensity level is 70 dB.
A) Determine what is the level at distance of 75 meter?
B) Determine what is the level at distance of 266 meter?
A camera maker wants to minimize the light reflected from the front of a camera lens. A coating is applied to the lens with an index of refraction of 1.55 and the lens itself has an index of refraction of 1.48.
When an electric heater is turned on, the Nichrome heating element is at 0° C and draws a current of 15 A, with a potential difference of 120 V between the ends of the element. The element heats up to 797° C, with the potential difference constant..
A uniform disk of 10 kg mass and 0.5 m diameter rolls without slipping on a flat horizontal surface. If the velocity of its center is 50 km/h, compute the total kinetic energy of the disk.
A woman on a 10 speed bicycle travels at 9 m/s relative to ground as a she passes a little boy on a tricycle going in the opposite direction. If the boy is travelling at 1m/s relative to the ground, how fast does the boy appear to be moving relati..
A personal computer is to be used to program several different PLCs from different manufacturers. Determine what would be required
During a snowmobile race our hero goes 16.7 km at 45 deg to the North of West (45 degrees above the -X). Then turns and goes 7.5 km due east. Then turns and goes 23 km at 40 degrees to the West of South (40 degrees to the left of -y).
A dart is thrown horizontally with an initial speed of 16 m/s toward point P, the bull's-eye on a dart board. It hits at point Q on the rim, How far away from the dart board is the dart released
Electric breakdown (sparks) occur in air if the electric field reaches 3×106 N/C. At this field strength, free electrons present in the atmosphere are rapidly accelerated to such large speeds that upon impact with atoms they knock electrons off of th..
A slingshot fires a pebble from the top of a building at a speed of 14.0 m/s. The building is 28.0 m tall. Ignoring air resistance, find the speed with which the pebble strikes the ground
A 1.0 µF capacitor is connected in parallel with a 2.4 µF capacitor, What is the equivalent capacitance of this combination
A solenoid contains 780 coils of very thin wire evenly wrapped over a length of 17.5cm . Each coil is 2.50cm in diameter. what is the magnetic field at its center
A coin is located 27.9 cm to the left of a converging lens (f = 20.0 cm). A second, identical lens is placed to the right of the first lens, Find the separation between the lenses
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